β-diketonatocopper(I) complex containing allene compounds as ligand and process for producing the same

ABSTRACT

A β-diketonatocopper(I) complex which contains as a ligand (L) an allene compound and is represented by formula (2)                    
     wherein, R 6  and R 7  may be the same or different and each represents linear or branched C 1-4  alkyl, C 1-4  alkoxy, or linear or branched C 1-4  fluoroalkyl, R 8  represents hydrogen or fluorine, and L represents the allene compound, and a process for producing the same. The complex is useful in forming a thin copper film by metal-organic vapor deposition (hereinafter abbreviated as MOCVD) method.

TECHNICAL FIELD

The present invention relates to a β-diketonatocopper(I) complex useful in forming a thin copper film by metal-organic vapor deposition (hereinafter abbreviated as MOCVD) method and a process for producing the same.

BACKGROUND ART

Conventionally, as a raw material for forming a thin copper film by MOCVD method, is well known β-diketonatocopper(I) complex comprising (vinyltrimethylsilane) (1,1,1,5,5,5-hexafluoro-2,4-pentanedionato) copper(I) of formula (α)

disclosed in Japanese Patent Laid-open No. Hei 5-59551.

However, vinyltrimethylsilane is used as a ligand for the β-diketonatocopper(I) complex of the formula (α). Conventionally, β-diketonatocopper(I) complex in which an allene compound is used as a ligand has not been known.

DISCLOSURE OF INVENTION

The present inventors research hard to find out novel β-diketonatocopper(I) complex in which an allene compound is used as a ligand from the above-mentioned viewpoint, and come to obtain β-diketonatocopper(I) complexes of formula (2) described below in which an allene compound of formula (1) described below is used as a ligand.

That is, the present invention relates to a β-diketonatocopper(I) complex which contains as a ligand (L) an allene compound of formula (1)

wherein R₁, R₂, R₃ and R₄ may be the same or different and each represents hydrogen, C₁₋₄ alkyl or (R₅)₃Si—, or R₁ and R₂, together with the carbon atom bonding them, may form 3- to 6-member ring, or R₂ and R₃, together with the allene bond group bonding them, may form 8- to 10-member ring, R₅s may be the same or different and independently of one another represent linear or branched C₁₋₄ alkyl, and which is represented by formula (2)

wherein, R₆ and R₇ may be the same or different and each represents linear or branched C₁₋₄ alkyl, C₁₋₄ alkoxy, or linear or branched C₁₋₄ fluoroalkyl, R₈ represents hydrogen or fluorine, and L represents the allene compound of formula (1).

Then, the present invention will be concretely explained.

The following is exemplified for each of the substituents in the chemical structural formula of allene compounds represented by formula (1) that is the ligand in the β-diketonatocopper(I) complexes of formula (2).

The substituents R₁, R₂, R₃ and R₄include, for example H, Me, Et, n-Pr, n-Bu, i-Pr, i-Bu, s-Bu, t-Bu, Me₃Si, Et₃Si, n-Pr₃Si, n-Bu₃Si, i-Pr₃Si, i-Bu₃Si, s-Bu₃Si, t-Bu₃Si, Me₂(Et)Si, Me₂(n-Pr)Si, Me₂(n-Bu)Si, Me₂(i-Pr)Si, Me₂(i-Bu)Si, Me₂(s-Bu)Si, Me₂(t-Bu)Si, Et₂(Me)Si, Et₂(n-Pr)Si, Et₂(n-Bu)Si, Et₂(i-Pr)Si, Et₂(i-Bu)Si, Et₂(s-Bu)Si, Et₂(t-Bu)Si, n-Pr₂(Me)Si, n-Pr₂(Et)Si, n-Pr₂(i-Pr)Si, n-Pr₂(n-Bu)Si, n-Pr₂(s-Bu)Si, n-Pr₂(t-Bu)Si, n-Bu₂(Me)Si, n-Bu₂(Et)Si, n-Bu₂(n-Pr)Si, n-Bu₂(i-Pr)Si, n-Bu₂(i-Bu)Si, n-Bu₂(s-Bu)Si, n-Bu₂(t-Bu)Si, i-Pr₂(Me)Si, i-Pr₂(Et)Si, i-Pr₂(n-Pr)Si, i-Pr₂(n-Bu)Si, i-Pr₂(s-Bu)Si, i-Pr₂(t-Bu)Si, i-Bu₂(Me)Si, i-Bu₂(Et)Si, i-Bu₂(n-Pr)Si, i-Bu₂(n-Bu)Si, i-Bu₂(i-Pr)Si, i-Bu₂(s-Bu)Si, i-Bu₂(t-Bu)Si, s-Bu₂(Me)Si, s-Bu₂(Et)Si, s-Bu₂(n-Pr)Si, s-Bu₂(n-Bu)Si, s-Bu₂(i-Pr)Si, s-Bu₂(i-Bu)Si, s-Bu₂(t-Bu)Si, t-Bu₂(Me)Si, t-Bu₂(Et)Si, t-Bu₂(n-Pr)Si, t-Bu₂(n-Bu)Si, t-Bu₂(i-Pr)Si, t-Bu₂(i-Bu)Si or t-Bu₂(s-Bu)Si.

When R₁ and R₂, together with the carbon atom bonding them, form 3- to 6-member ring, the ring includes cyclopropane ring, cyclobutane ring, cyclopentane ring or cyclohexane ring.

When R₂ and R₃, together with the allene bond group bonding them, form 8- to 10-member ring, the ring includes cyclooctane ring, cyclononane ring or cyclodecane ring.

The following is exemplified for each of the substituents in the chemical structural formula of the β-diketonatocopper(I) complexes of formula (2).

The substituents R₆ and R₇ include, for example, CF₃, C₂F₅, n-C₃F₇, i-C₃F₇, n-C₄F₉, Me, Et, n-Pr, n-Bu, i-Pr, i-Bu, s-Bu, t-Bu, MeO, EtO, n-PrO, n-BuO, i-PrO, i-BuO, s-BuO or t-BuO. In addition, the substituent R₈ includes, for example H or F.

The present invention also relates to a process for producing a β-diketonatocopper(I) complex represented by formula (2)

wherein, R₆ and R₇ may be the same or different and each represents linear or branched C₁₋₄ alkyl, C₁₋₄ alkoxy, or linear or branched C₁₋₄ fluoroalkyl, R₈ represents hydrogen or fluorine, and L represents the allene compound of formula (1), characterized in that the process comprises reacting an allene compound of formula (1)

wherein R₁, R₂, R₃ and R₄ may be the same or different and each represents hydrogen, C₁₋₄ alkyl or (R₅)₃Si—, or R₁ and R₂, together with the carbon atom bonding them, may form 3- to 6-member ring, or R₂ and R₃, together with the allene bond group bonding them, may form 8- to 10-member ring, R₅s may be the same or different and independently of one another represent linear or branched C₁₋₄ alkyl, with an enol compound of formula (3)

wherein R₉ and R₁₀ may be the same or different and each represents linear or branched C₁₋₄ alkyl, C₁₋₄ alkoxy, or linear or branched C₁₋₄ fluoroalkyl, R₁₁ represents hydrogen or fluorine in the presence of a copper(I) compound.

Next, the process for producing a β-diketonatocopper(I) complex according to the present invention will be explained in more detail on the basis of reaction formulae (A) and (B).

in formula (1) in reaction formula (A), R₁, R₂, R₃ and R₄ may be the same or different and each represents hydrogen, C₁₋₄ alkyl or (R₅)₃Si—, or R₁ and R₂, together with the carbon atom bonding them, may form 3- to 6-member ring, or R₂ and R₃, together with the allene bond group bonding them, may form 8- to 10-member ring, R₅s may be the same or different and independently of one another represent linear or branched C₁₋₄ alkyl, in formula (3) or (4), R₉ and R₁₀ may be the same or different and each represents linear or branched C₁₋₄ alkyl, C₁₋₄ alkoxy, or linear or branched C₁₋₄ fluoroalkyl, R₁₁ represents hydrogen or fluorine, in formula (2), R₆ and R₇ may be the same or different and each represents linear or branched C₁₋₄ alkyl, C₁₋₄ alkoxy, or linear or branched C₁₋₄ fluoroalkyl, R₈ represents hydrogen or fluorine, and L represents the allene compound of formula (1).

In the reaction represented by reaction formula (A), a β-diketonatocopper(I) complex in which an allene compound is coordinated can be synthesized by reacting an allene compound of formula (1) with an enol compound of formula (3) or a carbonyl compound of formula (4) (the compound of formula (4) is a tautomer of the compound of formula (3)) together with a copper(I) compound (CuX) of formula (5) optionally in the presence of a base (for example, inorganic base, such as sodium hydride, potassium hydride, sodium amide, potassium tertiary butoxide, potassium carbonate or the like).

The copper(I) compound includes, for example, Cu₂O, CuF, CuCl, CuBr, Cul, CuOAc, CuCN, CuSCN, CuOTf and so on.

The enol compound of formula (3) is a tautomer of the carbonyl compound of formula (4) as indicated in reaction formula (B).

The molar ratio of the allene compound to the enol compound may be arbitrarily set. However, it is preferable that the enol compound and allene compound are mixed in an amount equimolar or close thereto. For example, the molar ratio of the enol compound to the allene compound may be 0.5 to 1.5.

The molar ratio of the allene compound to the copper(I) compound may be arbitrarily set. However, it is preferable that copper atoms in the copper(I) compound are equimolar with allene compound or that an excessive of the copper atoms is mixed with the allene compound. For example, the molar ratio of the copper atoms to the allene compound may be 0.5 to 3. The molar ratio of the base to the allene compound may be arbitrarily set. However, it is preferable that the base is equimolar with the allene compound or that an excessive of the base is mixed with the allene compound. For example, the molar ratio of the base to the allene compound may be 0.5 to 3.

Although the reaction temperature is not particularly limited, the reaction may be carried out generally at a temperature between −110° C. and a boiling point of the solvent used in the reaction.

It is preferable to use solvents that do not participate in the reaction. The solvents that can be used include hydrocarbons (such as, hexane, pentane, benzene, toluene or the like), ethers (such as, diethyl ether, monoglyme, isopropyl ether, tetrahydrofuran, 1,4-dioxane or the like) and halogenated hydrocarbons (such as, dichloromethane, chloroform, dichloroethane or the like).

The β-diketonatocopper(I) complex according to the present invention is useful as a compound for forming a thin copper film by MOCVD method.

BEST MODE FOR CARRYING OUT THE INVENTION

The present invention will be concretely described on the basis of the following examples, but the present invention is not limited thereto at all.

EXAMPLE 1

Under nitrogen atmosphere, into 3.0 g of copper(I) oxide was poured 30 ml of dry dichloromethane that was fully degassed and the atmosphere of which was replaced with nitrogen to give a suspension solution. 1.77 g of 1-methyl-1-(trimethylsilyl) allene was added to the solution with vigorously stirring, then 3.2 g of 1,1,1,5,5,5-hexafluoro-2,4-pentanedione was slowly added from a dropping funnel. After the reaction solution was stirred for 12 hours, the solution was filtered under nitrogen atmosphere, and the filtrate was concentrated under reduced pressure at room temperature to give a green liquid. The liquid was purified through a column chromatography to give 4.2 g of [1-methyl-1-(trimethylsilyl) allene] (1,1,1,5,5,5-hexafluoro-2,4-pentanedionato) copper(I) containing 1-methyl-1-(trimethylsilyl) allene as a ligand represented by formula (6)

as an yellow liquid.

The resulting β-diketonatocopper(I) complex was identified with ¹H-NMR and ¹³C-NMR.

¹H-NMR (δ, CDCl₃) 0.19 (s, 9H), 1.97-1.99 (m, 3H), 4.14-4.16 (m, 2H), 6.15 (s, 1H). ¹³C-NMR (δ, CDCl₃)−2.29 (3C), 17.09, 51.00, 90.21, 96.13, 117.69 (q, J_(C-F)=283.7 Hz, 2C), 173.87, 178.33 (q, J_(C-C-F)=34.5 Hz, 2C).

For evaluating the vaporization characteristic of the resulting β-diketonatocopper(I) complex, the thermogravimetric curve (heating rate: 10° C./min., under nitrogen atmosphere) was measured. Consequently, it was found that the complex has extremely high volatility and good vaporization characteristic. Boiling point: 140-164° C.

EXAMPLE 2

Under nitrogen atmosphere, into 3.0 g of copper(I) oxide was poured 30 ml of dry dichloromethane that was fully degassed and the atmosphere of which was replaced with nitrogen to give a suspension solution. 1.72 g of 1,2-cyclononadiene was added to the solution with vigorously stirring, then 3.23 g of 1,1,1,5,5,5-hexafluoro-2,4-pentanedione was slowly added from a dropping funnel. After the reaction solution was stirred for 4 hours, the solution was filtered under nitrogen atmosphere, and the filtrate was concentrated under reduced pressure at room temperature to give a green liquid.

The liquid was purified through a column chromatography to give 5.63 g of (1,2-cyclononadiene) (1,1,1,5,5,5-hexafluoro-2,4-pentanedionato) copper(I) containing 1,2-cyclononadiene as a ligand represented by formula (7)

as an yellow solid.

The resulting β-diketonatocopper(I) complex was identified with ¹H-NMR and ¹³C-NMR.

¹H-NMR (δ, CDCl₃) 1.38-1.77 (m, 8H), 2.06-2.24 (m, 4H), 5.26-5.32 (m, 2H), 6.10 (s, 1H). ¹³C-NMR (δ, CDCl₃) 23.65, 25.49, 28.44, 88.28, 90.61, 118.65 (q, J_(C-F)=284.1 Hz, 2C), 173.83, 178.63 (q, J_(C-C-F)=34.6 Hz, 2C).

For evaluating the vaporization characteristic of the resulting β-diketonatocopper(I) complex, the thermogravimetric curve (heating rate: 10° C./min., under nitrogen atmosphere) was measured. Consequently, the complex had a melting point of 46.8° C. and a boiling point of 195.6° C.

EXAMPLE 3

In a similar manner as Example 2, starting from 3.0 g of copper(I) oxide, 1.30 g of 1,2-heptadiene and 3.23 g of 1,1,1,5,5,5-hexafluoro-2,4-pentanedione, 2.82 g of (1,2-heptadiene) (1,1,1,5,5,5-hexafluoro-2,4-pentanedionato) copper(I) containing 1,2-heptadiene as a ligand represented by formula (8)

was obtained as an yellow liquid.

¹H-NMR (δ, CDCl₃) 0.89 (t, J=7.3 Hz, 3H), 1.30-1.42 (m, 2H), 1.42-154 (m, 2H), 2.15-2.27 (m, 2H), 4.33-4.40 (m, 2H), 5.45-5.55 (m, 1H), 6.13 (s, 1H). ¹³C-NMR (δ, CDCl₃) 13.95, 22.46, 31.50, 31.70, 55.72, 90.76, 92.44, 117.96 (q, J_(C-F)=283.7 Hz, 2C), 165.80, 178.85 (q, J_(C-C-F)=34.5 Hz, 2C).

For evaluating the vaporization characteristic of the resulting β-diketonatocopper(I) complex, the thermogravimetric curve (heating rate: 10° C./min., under nitrogen atmosphere) was measured. Consequently, the complex had a boiling point of 150.0° C.

EXAMPLE 4

In a similar manner as Example 2, starting from 3.0 g of copper(I) oxide, 2.16 g of 1-(dimethyl-tert-butylsilyl) allene and 3.23 g of 1,1,1,5,5,5-hexafluoro-2,4-pentanedione, 3.47 g of [(1-(dimethyl-tert-butylsilyl) allene)] (1,1,1,5,5,5-hexafluoro-2,4-pentanedionato) copper(I) containing 1-(dimethyl-tert-butylsilyl) allene as a ligand represented by formula (9)

was obtained as an yellow liquid.

¹H-NMR (δ, CDCl₃) 0.20 (s, 6H), 0.97 (s, 9H), 4.35 (d, J=4.0 Hz, 2H), 4.87 (t, J=4.4 Hz, 1H), 6.15 (s, 1H). ¹³C-NMR (δ, CDCl₃) −5.40, 18.72, 26.61, 55.36, 69.50, 90.93, 117.94 (q, J_(C-F)=283.8 Hz, 2C), 159.51, 178.96 (q, J_(C-C-F)=34.8 Hz, 2C).

For evaluating the vaporization characteristic of the resulting β-diketonatocopper(I) complex, the thermogravimetric curve (heating rate: 10° C./min., under nitrogen atmosphere) was measured. Consequently, the complex had a boiling point of 140.0° C.

EXAMPLE 5

In a similar manner as Example 2, starting from 3.0 g of copper(I) oxide, 1.54 g of 1-(tert-butyl)-2-methyl allene and 3.23 g of 1,1,1,5,5,5-hexafluoro-2,4-pentanedione, 1.78 g of [1-(tert-butyl)-2-methyl allene] (1,1,1,5,5,5-hexafluoro-2,4-pentanedionato) copper(I) containing 1-(tert-butyl)-2-methyl allene as a ligand represented by formula (10)

was obtained as an yellow liquid.

¹H-NMR (δ, CDCl₃) 1.18 (s, 9H), 1.89-1.98 (m, 3H), 5.30-5.40 (m, 2H), 6.11 (s, 1H). ¹³C-NMR (δ, CDCl₃) 18.42, 30.41, 36.41, 79.79, 90.77, 93.20, 117.94 (q, J_(C-F)=283.8 Hz, 2C), 150.16, 178.78 (q, J_(C-C-F)=34.9 Hz, 2C).

For evaluating the vaporization characteristic of the resulting β-diketonatocopper(I) complex, the thermogravimetric curve (heating rate: 10° C./min., under nitrogen atmosphere) was measured. Consequently, the complex had a boiling point of 147.0° C.

EXAMPLE 6

Under nitrogen atmosphere, into 3.0 g of copper(I) oxide was poured 30 ml of dry dichloromethane that was fully degassed and the atmosphere of which was replaced with nitrogen to give a suspension solution. 0.96 g of 1,1-dimethyl allene was added to the solution with vigorously stirring, then 3.2 g of 1,1,1,5,5,5-hexafluoro-2,4-pentanedione was slowly added from a dropping funnel. After the reaction solution was stirred for 12 hours, the solution was filtered under nitrogen atmosphere, and the filtrate was concentrated under reduced pressure at room temperature to give a green liquid.

The liquid was purified through a column chromatography to give 2.3 g of (1,1-dimethyl allene) (1,1,1,5,5,5-hexafluoro-2,4-pentanedionato) copper(I) containing 1,1-dimethyl allene as a ligand represented by formula (11)

as an yellow liquid.

The resulting β-diketonatocopper(I) complex was identified with ¹H-NMR and ¹³C-NMR.

¹H-NMR (δ, CDCl₃) 1.96 (t, J=2.8 Hz, 6H), 4.16 (t, J=2.8 Hz, 2H), 6.16 (s, 1H). ¹³C-NMR (δ, CDCl₃) 22.63 (2C), 50.03, 90.24, 108.41, 117.75 (q, J_(C-F)=284.9 Hz, 2C), 175.10, 178.40 (q, J_(C-C-F)=34.7 Hz, 2C).

EXAMPLE 7

Under nitrogen atmosphere, into 3.0 g of copper(I) oxide was poured 30 ml of dry dichloromethane that was fully degassed and the atmosphere of which was replaced with nitrogen to give a suspension solution. 1.35 g of 1,1,3,3-tetramethyl allene was added to the solution with vigorously stirring, then 3.2 g of 1,1,1,5,5,5-hexafluoro-2,4-pentanedione was slowly added from a dropping funnel. After the reaction solution was stirred for 12 hours, the solution was filtered under nitrogen atmosphere, and the filtrate was concentrated under reduced pressure at room temperature to give a green liquid.

The liquid was purified through a column chromatography to give 3.8 g of (1,1,3,3-tetramethyl allene) (1,1,1,5,5,5-hexafluoro-2,4-pentanedionato) copper(I) containing 1,1,3,3-tetramethyl allene as a ligand represented by formula (12)

as an yellow solid.

The resulting β-diketonatocopper(I) complex was identified with ¹H-NMR and ¹³C-NMR.

¹H-NMR (δ, CDCl₃) 2.00 (s, 12H), 6.18 (s, 2H). ¹³C-NMR (δ, CDCl₃) 24.84 (4C), 90.50 (2C), 93.25 (2C), 117.81 (q, J_(C-F)=285.3 Hz, 4C), 145.33, 178.61 (q, J_(C-C-F)=34.7 Hz, 4C).

Table 1 indicates the β-diketonatocopper(I) complexes (including ones synthesized in Examples described above) of the present invention synthesized according to the producing process or Examples described above along with allene compounds of their ligands (L) [formula (1)], but the present invention is not limited thereto.

TABLE 1 (1)

R₁ R₂ R₃ R₄ H H H H H Me H H H Et H H H n-Pr H H H n-Bu H H H i-Pr H H H i-Bu H H H s-Bu H H H t-Bu H H H Me₃Si H H H Et₃Si H H H n-Pr₃Si H H H n-Bu₃Si H H H i-Pr₃Si H H H Me₂(Et)Si H H H Me₂(n-Pr)Si H H H Me₂(i-Pr)Si H H H Me₂(t-Bu)Si H H Me Me H H Me Et H H Me n-Pr H H Me n-Bu H H Me i-Pr H H Me i-Bu H H Me s-Bu H H Me t-Bu H H Me Me₃Si H H Me Et₃Si H H Me n-Pr₃Si H H Me n-Bu₃Si H H Me i-Pr₃Si H H Me Me₂(Et)Si H H Me Me₂(n-Pr)Si H H Me Me₂(i-Pr)Si H H Me Me₂(t-Bu)Si H H Et Et H H Et n-Pr H H Et n-Bu H H Et i-Pr H H Et i-Bu H H Et s-Bu H H Et t-Bu H H n-Pr n-Pr H H n-Pr n-Bu H H n-Pr i-Pr H H n-Pr i-Bu H H n-Pr s-Bu H H n-Pr t-Bu H H n-Bu n-Pr H H n-Bu i-Pr H H n-Bu i-Bu H H n-Bu s-Bu H H n-Bu t-Bu H H Me₃Si Et H H Me₃Si n-Pr H H Me₃Si n-Bu H H Me₃Si i-Pr H H Me₃Si i-Bu H H Me₃Si s-Bu H H Me₃Si t-Bu H H n-Bu₃Si Et H H n-Bu₃Si n-Pr H H n-Bu₃Si n-Bu H H n-Bu₃Si i-Pr H H n-Bu₃Si i-Bu H H n-Bu₃Si s-Bu H H n-Bu₃Si t-Bu H H Me₂(t-Bu)Si Et H H Me₂(t-Bu)Si n-Pr H H Me₂(t-Bu)Si n-Bu H H Me₂(t-Bu)Si i-Pr H H Me₂(t-Bu)Si i-Bu H H Me₂(t-Bu)Si s-Bu H H Me₂(t-Bu)Si t-Bu H H Me₃Si Me₃Si H H Me₃Si Me₂(t-Bu)Si H H —(CH₂)₂— H H —(CH₂)₅— H H Me H Me H Me H Et H Me H n-Pr H Me H n-Bu H Me H i-Pr H Me H i-Bu H Me H s-Bu H Me H t-Bu H Me H Me₃Si H Me H Et₃Si H Me H n-Pr₃Si H Me H n-Bu₃Si H Me H i-Pr₃Si H Me H Me₂(Et)Si H Me H Me₂(n-Pr)Si H Me H Me₂(i-Pr)Si H Me H Me₂(t-Bu)Si H Et H Et H Et H n-Pr H Et H n-Bu H Et H i-Pr H Et H i-Bu H Et H s-Bu H Et H t-Bu H n-Pr H n-Pr H n-Pr H n-Bu H n-Pr H i-Pr H n-Pr H i-Bu H n-Pr H s-Bu H n-Pr H t-Bu H n-Bu H n-Pr H n-Bu H i-Pr H n-Bu H i-Bu H n-Bu H s-Bu H n-Bu H t-Bu H Me₃Si H Et H Me₃Si H n-Pr H Me₃Si H n-Bu H Me₃Si H i-Pr H Me₃Si H i-Bu H Me₃Si H s-Bu H Me₃Si H t-Bu H n-Bu₃Si H Et H n-Bu₃Si H n-Pr H n-Bu₃Si H n-Bu H n-Bu₃Si H i-Pr H n-Bu₃Si H i-Bu H n-Bu₃Si H s-Bu H n-Bu₃Si H t-Bu H Me₂(t-Bu)Si H Et H Me₂(t-Bu)Si H n-Pr H Me₂(t-Bu)Si H n-Bu H Me₂(t-Bu)Si H i-Pr H Me₂(t-Bu)Si H i-Bu H Me₂(t-Bu)Si H s-Bu H Me₂(t-Bu)Si H t-Bu H Me₃Si H Me₃Si H Me₃Si H Me₂(t-Bu)Si H H —(CH₂)₆— H H —(CH₂)₇— H Me Me Me H Me Et Me H Me Et i-Bu H Me i-Bu Me H Me Me Me₃Si H Me Me₃Si n-Bu H n-Bu Me₃Si Me H Me Me₃Si Me₃Si H Me₃Si Me₃Si Me₃Si H —(CH₂)₄— Me H —(CH₂)₅— Me H Me —(CH₂)₆— H Me Me Me Me Me n-Bu Me Me Me Me₃Si Me n-Pr n-Bu Me₃Si Me Me Me Me₃Si n-Bu n-Bu Me₃Si Me₃Si Me₃Si Me₃Si —(CH₂)₅— Me n-Pr

Industrial Applicability

The present invention provides novel β-diketonatocopper(I) complexes and processes for producing the same. The β-diketonatocopper(I) complexes according to the present invention are useful as compounds for forming a thin copper film by MOCVD method. 

What is claimed is:
 1. A β-diketonatocopper(I) complex which contains as a ligand (L) an allene compound of formula (1)

wherein R₁, R₂, R₃ and R₄ may be the same or different and each represents hydrogen, C₁₋₄ alkyl or (R₅)₃Si—, or R₁ and R₂, together with the carbon atom bonding them, may form 3- to 6-member ring, or R₂ and R₃, together with the allene bond group bonding them, may form 8- to 10-member ring, R₅s may be the same or different and independently of one another represent linear or branched C₁₋₄ alkyl, and which is represented by formula (2)

 wherein, R₆ and R₇ may be the same or different and each represents linear or branched C₁₋₄ alkyl, C₁₋₄ alkoxy, or linear or branched C₁₋₄ fluoroalkyl, R₈ represents hydrogen or fluorine, and L represents the allene compound of formula (1).
 2. A process for producing a β-diketonatocopper(I) complex represented by formula (2)

wherein, R₆ and R₇ may be the same or different and each represents linear or branched C₁₋₄ alkyl, C₁₋₄ alkoxy, or linear or branched C₁₋₄ fluoroalkyl, R₈ represents hydrogen or fluorine, and L represents the allene compound of formula (1), characterized in that the process comprises reacting an allene compound of formula (1)

 wherein R₁, R₂, R₃ and R₄ may be the same or different and each represents hydrogen, C₁₋₄ alkyl or (R₅)₃Si—, or R₁ and R₂, together with the carbon atom bonding them, may form 3- to 6-member ring, or R₂ and R₃, together with the allene bond group bonding them, may form 8- to 10-member ring, R₅s may be the same or different and independently of one another represent linear or branched C₁₋₄ alkyl, with an enol compound of formula (3)

 wherein R₉ and R₁₀ may be the same or different and each represents linear or branched C₁₋₄ alkyl, C₁₋₄ alkoxy, or linear or branched C₁₋₄ fluoroalkyl, R₁₁ represents hydrogen or fluorine in the presence of a copper(I) compound. 